Immer voll, immer leer
You show your audience a small black plastic tube with two silver caps on the ends. You show the tube to be completely empty and hand it out to the audience to examine. You then show a small silk handkerchief and make it vanish!
After showing your hands to be empty, you open the tube and remove the silk! Everything can again be examined.
You receive the plastic tube, a gimmick, 2 silks and instructions.